Stu said he can do what he likes just like those NI players. He didn't say Grealish's nationality is like those NI players.
In your opinion every sentence uttered by any footballer or family member of a footballer is laden with meaning and intent. "International club" could mean he feels close to the team because he has been with them for so long (more likely in my opinion) or it could mean that it's just who he's playing for at the moment. It's ambiguous but not sinister.
Grealish is of mixed heritage and dual nationality. He can, as Stu says, play for who he wants. I hope he plays for us.
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